Method of operating steam-boiler economizers.



D S. JACOBUS & H. C. HEATON METHOD 0F QPERANNG STEAM BOILER Ecomowuzms.

APPLICATION FILED D508. 19H.

l ,285,26 l., A muted Nm'. 19, 1918 N. rios..

DAVID S. TACBU GF LRSEY CET?, NEW JERSEY, AND HERMAN C. HEATON, 0F CHICAGG, ILLIZTIS, ASSG-GES TQ THE BABCOOK it WILCOK COMPANY, 0F BAYONNE, NEVI JERSEY, A CORRTIN 0F NEVI ERSEY.

METHQD OIE PERATING STEAM-30111233; ECGNMIZERS.

speedtest@ of essere same.

Application led December S, 1914. Serial No. 376,916.

To all 1li/0m t may concern:

Be it known that We, DAVID S. .SAcosos and HERMAN C. Hetero-N, citizens of the United States, reidiig, respectively, at Jersey City, in thercounty of Hudson aud State of New Jersey, alud at Chicago, iu the county of Cook, in the State of illinois, have invented certain new and useful im )rovements in Methods of Operating i team- Boiler Eeonomizers, of which the following is a specification.

Our invention rch tes to that type ofcour bined boilers and ecouomiaers wherein mois 4,ture from the flue gases is condensed ou the economizer or part thereof.

The moisture which is thug,y condensed from the flue' gases in the ecouomizer is derived from three sources-(1) the moisture in the air entering the furnace; '(2) the moisture in the fuel; and (3) the moisture produced through the combustion of the hydrogen component of the fuel. The amount of moisture which may he condensed from the-flue gases depends upon the temi' erature of the entericfr feed Water. aud

e temperature of the gases. nWith a feed tater temperature of, soy, 8Go F., entering that part of the economiser which is subjected to the coldest gases, the dew point will be reduced to 8G@ l?. as a minimum, and the amount of moisture carried oli by the liuc. gases will correspond to the actual dew point which maf be, say, 90 F. The volume of the tlue gases is approximately that or" the entering air and, therefore, der the assumed conditions, if the air entering the furnace is saturated at 90o Ffthere would be substantially no loss of latent heat through the carrying; ed' of the moisture in the due gases. as the total amount of latent heat in the vapor Woold be about the same in each case. The general purpose of the iriventioii, therefore, is the satirration fof the air entering a furnace with moisture so that this moisture Will carry enough latent heat into 'the system to oli-set the usual loss through the heat in the repec which escapes with the due leases. Any additional vapor over this smouut will be available for eondensetion upon the economizer tubes and will add to the heat iniparted and to the eilicieecy.

In order to eneble our invention to he practised, that 'part of the economizer where the moisture is condensed must be arranged so that it will .resist the corrosive action of the moisture and acid fumes. To accomplish this the part of the ecouomizer in' question must be constructed of acid-resst ing material, or, if constructed of tubes that will not be acid1esisting, these tubes must he coated with a material which will resist the acid. The eeouomizer system described in the application of David S. Jacobus, Serial No. 784,3o, iiled August l2, l9l3, is especially applicable for the purpose and such an economizer is shown in the accompanying drawihg, which is diagrammatic and shows that art of a steam boiler plant necessary to illliistrate the invention. In this drawing the numeral l designates u boiler of standard design, shown as fired by a chain grate Stoker 2. The course of the gases through the boiler to the outlet due 3 is indicated by the arrows. In this flue is placed an economizer, comprising a high pressure stage 4, and a low pressure stage having three separated banks of tubes, 5, (S and 7. The high pressure stage subjected to the hottest gases and the low pressure stage to the coldest gases. the rases leaving the economizer 'through an exhaust iau 8 and discharging into the stack The present inrention is not concerned with the parv ticular construction oi" the ecouomizer. it

Y pressure banks may be mede up of cast iron tubes connected to cast iron headers or boxes and covered with au aeid-resistiug material or tubes other than cast iron may be used. The easing has doors 10 jeading to the spaces between the banks for the purpose of providing; access to thc tubes. `We have shown Scrapers il for removing any deposit which may collect upon the tubes. Below each baul: a pit lf3 into which the deposit permitted to accumulate. lihese pits also receive the condensed vapor from the The feed water from the het Well, or other source, is delivered to bank ot tuhes '7 oit the low pressure stage of econo1 miser throogh a pipe *i3 and from seid haelt it tios/s downward through a piges-'lei to the 5; 1?; may be Olfl lj CHOIMZ which 31e moisi-Jule tha ley will esst v 60 Y n and desi-fe to Secure by the nte S'mes is Lim Gf u power phmt pplynb mestue, heatom said. power plum? 'io 55 Joel furnace t0 a suf condensation of at Yiwu e-E seul 1mi ure en an econ@- 1 the e over fconomizer to the boilers., se) down to a. gmini Where le of lle nrof'uced mo5- eondemed ou hey ecouomzer Y 75 nfnon 0f u power plant the @if suppyng at leastv a pt?" ,ated condense? Water to lle @Her furnace to sueen condensation at ea'st a estlle ou im. eeonomzer, Y he ine ever an *vuele ne, feeding Watel f economze' te the boiler, and he we 5 dome to e. point Whefe at S5 u ef the iufedueed moisture :sed en the eeonemzel tubes, pemen si a exe. phml the ef bling* e cooling Water e contaet with i"v into a bolelfiulgages from the boiler eeeuomze, feeding www. eeenomzer ie the boiel', and 95 Lms a peron of the intr@ am Said ecolemze'.

ee We have hereunto fhe plesence of the sui "e of Herman C. 

